Heat Pump Contractors London: What to Look For When Choosing an Installer
Choosing the right heat pump contractor in London makes a bigger difference to how your system performs than almost any other decision in the process. The same heat pump unit can deliver years of efficient, reliable heating or a frustrating and costly experience, depending entirely on how well it is designed, sized and installed. This guide covers the credentials to check, the questions worth asking, and the red flags to watch for when comparing heat pump contractors in London.
Why the Contractor Matters More Than the Brand
Heat pump brands like Samsung, Vaillant, Daikin and Mitsubishi all produce well-engineered, reliable systems. The performance difference between a correctly installed heat pump and a poorly installed one is far greater than the difference between brands. A heat pump that has been correctly sized through a full heat loss survey, installed with the right pipework, and commissioned properly will run quietly and efficiently for years. One that hasn’t may struggle to heat the home, run up higher electricity bills, or develop faults that require expensive repairs.
In London particularly, where properties range from Victorian terraces to modern flats and large detached homes, the design and sizing of a heat pump system is not something that can be done from a desk without visiting the property. Any contractor who offers to quote without an in-person or detailed survey visit should be approached with caution.
What Credentials Should a Heat Pump Contractor Have?
MCS Certification: Non-Negotiable
MCS certification (Microgeneration Certification Scheme) is the industry standard for heat pump installation in the UK. It is also a legal requirement for accessing the £7,500 Boiler Upgrade Scheme grant. An MCS certified contractor has met strict quality standards and is independently assessed on a regular basis. You can verify any contractor’s MCS status directly at mcscertified.com.
Do not use any contractor who cannot provide their MCS certification number, or whose number does not appear on the MCS database. Without MCS certification, you cannot claim the £7,500 grant and your installation will not meet the minimum required standard.
Manufacturer Accreditations
Beyond MCS, the leading heat pump brands operate their own approved installer programmes. These are separate to MCS and represent an additional level of vetting by the manufacturer. For London homeowners, the most relevant are:
- Samsung approved installer: gives access to the extended 7-year Samsung warranty on qualifying installations, compared to the standard 2-year manufacturer warranty
- Vaillant Renewables Partner: Vaillant’s accredited installer programme for the aroTHERM Plus range
- Daikin Sustainable Homes approved installer: Daikin’s accreditation for residential heat pump installation
- Mitsubishi accredited installer: covering the Ecodan range, one of the UK’s most widely installed heat pump systems
Green Electro Heating holds approved installer status for Samsung, Vaillant, Daikin and Mitsubishi, as well as Clivet, giving our customers access to the full manufacturer warranty on each brand we install.
RECC Membership
The Renewable Energy Consumer Code (RECC) is a CTSI-backed consumer protection scheme covering renewable energy installations. RECC members are required to follow strict standards on pre-sales conduct, contracts, cancellation rights and aftercare. Choosing a RECC member gives you an additional layer of protection and access to an independent mediation service if any dispute arises.
NICEIC Approval
Heat pump installation involves significant electrical work, including dedicated consumer units and connection to the property’s electrical supply. An NICEIC approved contractor has been assessed for the quality and safety of their electrical installation work. This is worth checking alongside MCS certification.
What to Ask a Heat Pump Contractor Before Agreeing to Anything
Before accepting any quote, ask these questions:
- Will you carry out a full room-by-room heat loss survey before designing the system? A reputable contractor will always do this before specifying a system size.
- What system size are you proposing and why? The contractor should be able to explain how they arrived at the system size based on the heat loss calculation for your property.
- Which brands do you install and are you an approved installer for those brands? Approved installer status affects the warranty you receive.
- Who will carry out the installation, your own engineers or subcontractors? If subcontractors are used, clarify who holds MCS certification and who takes responsibility for the installation.
- What does the commissioning process involve? A proper commissioning should include full system setup, controller configuration, DNO notification and MCS certification documentation.
- What aftercare and servicing do you offer? Knowing your installer can also service the system going forward is reassuring.
Red Flags to Watch For
- A quote provided without any site visit or detailed property survey
- Pressure to sign quickly or accept a discount for signing on the day
- No MCS certification number provided or an inability to verify it on the MCS database
- Vague answers about who will carry out the installation and who holds the relevant certifications
- No mention of a heat loss survey as part of the design process
- Unusually low quotes that don’t include commissioning, DNO notification or MCS certification paperwork
Why London Properties Need an Experienced Local Contractor
London’s housing stock is one of the most varied of any city in the UK. Victorian terraces, mansion flats, new build apartments, period conversions and large detached homes all have different heat loss characteristics, different emitter systems, and different access considerations for the outdoor unit. An experienced London heat pump contractor will have worked across these property types and understand the specific challenges each one presents, from planning considerations in conservation areas to the constraints of installing an outdoor unit in a dense terrace.
Green Electro Heating has completed installations across London, from Clapham and Brentford to Muswell Hill, Winchmore Hill, Islington and Enfield. Each installation starts with a full heat loss survey and system design specific to the property, not a generic specification based on property size alone.
Getting Multiple Quotes: What to Compare
Getting two or three quotes is sensible, but comparing quotes requires looking at more than just the bottom line figure. When comparing quotes from heat pump contractors in London, check:
- Whether the system size and specification is the same across quotes, or whether one contractor has sized the system differently
- What is and isn’t included, commissioning, DNO notification, MCS certificate, warranty registration and Building Control Certificate should all be included as standard
- The warranty length offered on the heat pump, this varies depending on the brand and whether the contractor holds approved installer status
- Whether the BUS grant has been deducted in the quote, and whether the contractor is confirmed as able to apply for it on your behalf
Looking for a heat pump contractor in London?
Green Electro Heating is MCS certified and holds approved installer status for Samsung, Vaillant, Daikin, Mitsubishi and Clivet. Every installation starts with a full heat loss survey and is backed by the relevant manufacturer warranty. Call us on 020 3837 0778 or email info@electro-heating.co.uk to arrange a free assessment.
Book your free heat pump assessment
Sources: MCS Installer Operating Requirements 2026, RECC Consumer Code, MCS certified installer database mcscertified.com, manufacturer accreditation programmes for Samsung, Vaillant, Daikin and Mitsubishi, June 2026.
By Matthew Fasami